Having discussed a method for service realization in Chapter VII, the service methodology that was first outlined in the Introduction of this book is now complete. We have covered the following, so far: • Service concepts and fundamentals (Chapter II). • Service identification from business models and modeling, using the IDEF0/ IDEF1X notations (Chapter VII). • Service realization using the MDA transformation of business services to executable Web services (Chapter V). • Environments for service execution and management (Chapter IX). This chapter demonstrates how the above aforementioned concepts and methods can be applied to the analysis design and implementation of real business services. The business domain that we have chosen, accounts.payable/accounts.receivable (A/R-A/P), is pervasive, but by no means trivial. In this chapter, we approach this traditional accounting domain from a fresh, service-oriented perspective, by following the steps of the approach presented in the previous chapters, to show how services can be realized. We finally implement the modeled services using the CLMS service engineering platform that was first introduced in Chapter IX.